Type-writing machine



(No Model.)

W. CLARK.

I TYPE WRITING MAGHINE. v o.49s,015. Patented Mar. 7, 1893. j

LIIIIIHHJJHHHHI JIHIIIHIIJIIIIHHIJIHIII HL IHHHII I/VILLIAM CLARK, OFNORTH GREENFIELD, \VISCONSIN.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 493,015, dated March 7,1893. Application filed September 12, 1892. Serial No. 445,659. (Nomodel.)

To a whom it may concern:

Be it known that I, WILLIAM CLARK, a subject of the Queen of GreatBritain, and a resident of North Greenfield, in the county of Milwaukee,and in the State of Wisconsin, have invented certain new and usefulImprovements in Type-Writing Machines; and I do hereby declare that thefollowing is a full, clear, and exact description thereof.

My invention relates to new and useful improvements in type writingmachines, and relates more particularly to improvements in theconstruction and arrangement of the graduated scales for indicating thedegree of movement of the type writer carriage upon the track.

In the accompanying drawings illustrating my invention: Figure 1 is avertical transverse sectionalview of atype writer carriage and track towhich my improvement has been applied, said section being taken on line11 of Fig. 3. Fig. 2 is an end elevation of the same. Fig. 3 is a frontelevation of the same showing the carriage in its raised position.

In said drawings: A A represent the guide rods which form the track forthe carriage and upon which blocks B B which are connected with thecarriage, are arranged to slide.

0 represents the carriage.

D D represent the usual rack bars carried by a frame D slidingly engagedupon the rod A between the blocks B B.

E represents the usual vibrating arm carrying at its free end a pawl Ewhich is arranged tomove alternately into engagement with the two rackbars D D. The frame D is arranged to vibrate upon the' rod A in theusual manner so as to raise the rack bars D D above the level of thepawl E so as to permit the carriage to be moved freely lengthwise of therods A A, but normally rest in the position shown in the drawings, withthe said rack bars in engagement with said pawl.

F represents the usual graduated scale secured to the underside of thecarriage for indicating the exact position of any letter or characterupon a line of writing.

G G represent forwardly extending arms, conveniently connected togetherat their rear ends by means of a transverse bar G which is secured byscrews 9 g to the forward side of the frame D, and said arms carry attheir forward ends, a longitudinal bar H, which is marked with asuitable graduated scale, the divisions of which correspond with thedivisions of the scale F. By this construction the scale bar H beingcarried by the arms G G, which are secured to the frame D, willobviously be carried with the carriage in its step by step movement, andin order to indicate the degree of such movement I provide an indexfinger I upon the machine frame, adjacent to the path of the bar H. Aprojecting thumb piece G is provided upon the forward end of one of thearms G G, by means of which said arms, togetherwiththe connected frameD, may be readily vibrated so asto lift the rack bars D D out ofengagement with the pawl E, and permit the carriage to be adjusted ineither direction.

It will be seen, that by the described construction, both of thegraduated scales are carried by the carriage and move together, so that,when a letter is printed upona sheet of paper in the machine, its exactlocation upon the line will be indicated upon the scale H, by the indexfinger I, and when an error has been made, it is only necessary to notethe mark upon the scale F opposite which the error occurs, and then tomove the carriage back until the index finger I'points to thecorresponding mark upon the graduated scale H, when the carriage will bein position for another character to be printed in place of the oneerroneously printed. By my improved construction, the carriage may bethrown back as in Fig. 3 so as to enable the operator to view the pageof writing in the machine, and to simultaneously view both of thescales. When the carriage is in this position the operator may bydepressing one of the arms G, elevate the racks D D out of engagementwith the pawl E, and thus permit the carriage to be adjusted in eitherdirection desired, and this operation may be performed by the same handthat is employed to throw back the carriage.

It has been customary heretofore, to provide type writing machines withtwo scales, one secured to the carriage in the same manner as the scaleF, and the other secured rigidly to the front part of the machine frame,

an index finger or pointer being secured to the carriage and arranged toindicate upon the stationary scale, the degree of movement of thecarriage. In this construction however, it has been necessary to numberthe scale upon the carriage to read progressively from left to right,and the stationary scale on the machine frame to read progressively fromright to left. This reverse marking of the two scales is often the causeof mistakes and it is often difficult, especially to beginners, toascertain by the scales, the precise location of a word letter orcharacter, and it is furthermore impossible to adjust the carriage Whileit is raised, from the fact that the pointer is carried by the carriageand only indicates the position of the carriage when the carriage isdown. By my improvement, however I am enabled to construct both scalesso as to read from left to right, the marking being identical upon both,so as to entirely avoid the confusion arising from the reverse readingscales.

Another advantage gained by my improved construction is that, by thearrangement of the thumb piece G at the front of the carriage, theoperator is enabled to more readily operate it to free the carriage thanif it were located at the back of the machine as is usually the case inthe construction of type writing machines.

My improvement may be very readily applied to the ordinary styles orforms of Writiug machines by simply securing the longitudinal bar orstrip G to the frame D in the manner described, and securing theindicating finger I in position upon the machine frame. a h

Having thus fully described my invention, What I claim as new, anddesire to secure by Letters Patent of the United States, is-

1. The combination with the frame, track and carriage of a type Writingmachine, of a vibratory frame, carried by the carriage and provided withone or more rack bars, a pawl arranged to engage with the teeth of saidbars, a graduated scale of measurements secured to the under side of thecarriage, arms secured to said vibratory frame and extendiug forwardbeyond the carriage and carrying a second graduated scale havingmarkings identical with those of the first mentioned scale, and an indexfinger or pointer secured to the machine frame adjacent to the line ofmovement of the latter scale, substantially as set forth.

2. The combination with the frame, track and carriage of a type writingmachine, of a pawl, a vibratory frame carried by the carriage andprovided with one or more rack bars adapted to normally rest inengagement with said paivl, a graduated scale of measurements secured tothe underside of thecjarriage, arms secured to the vibratory frame andextending forwardly beyond the carriage and carrying at their forwardends a second grad uated scale having markings identical With those ofthe first mentioned scale, an index finger or pointer upon the machineframe adjacent to the line of movement of the latter scale, and a thumbpiece upon one of the arms for vibrating said arms so as to move therack bars carried by the vibratory frame, out of operative engagementwith the paivl, substantially as set forth.

In testimony that I claim tlieforegoing I have hereunto set my hand, atMilwaukee, in the county of Milwaukee andSt-ate of Wisconsin, in thepresence of two Witnesses.

, WILLIAM CLARK. Witnesses:

JOHN E. Wrnns,

H. G. UNDERVVOOD.

